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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efe60646fb7a0ab8555fb3762c82c1b29c5ecaf9a6c253c58e4469e9cf70d96' 
  AND token = 'Z+D+PFej5snrOkRhleN/iPwk8gmN2EHrN35P7pNehLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}